固体潮观测仪器传递函数分析与验证-理论物理专业论文.docxVIP

I I 摘要 固体潮是固体地球在太阳、月亮等天体的引潮力作用下引起的弹性-塑性形变。 固体潮的观测与研究是经典大地测量的一种重要方法，能够直接反映地球内部的各 种物理现象。随着空间技术的应用和全球地球动力学计划的实施，固体潮观测与研 究更具有前景。 然而，由于长期以来固体潮观测仪器的传递函数没有像地震计一样完整具体的 给出，以致我们在对其数据进行学习和研究有很大的影响与困难。HUST 台在长期进 行固体潮信号和地震信号的观测中发现，在固体潮观测仪所采集的信号中有一些信 号的频率处于固体潮信号和地震信号之间，这个频段是不在固体潮观测仪的通带范 围内的，而是应该在地震计等宽频带观测仪中才会出现。但是由于固体潮观测仪的 传递函数没有具体完整的给出，因而我们无法对此类信号进行深入的学习与研究， 暂时称之为“震颤异常波”。 我所从事的工作： 1.给出了 DZW 重力仪和 VS-1 倾斜仪等固体潮观测仪器的传递函数，并对传递函数 的实验验证做了初步讨论。 2.以此传递函数为基础，对固体潮观测中的“震颤异常波”现象进行分析。说明其 产生的原因是由于固体潮仪器的弱阻尼和采样时的混叠现象。 3.将固体潮观测仪同地震计等宽频带观测仪进行比较学习，从中了解他们的特性与 异同点，为将来从事震颤的观测学习和研究打好基础。 关键词: 固体潮,重力仪,倾斜仪,传递函数,震颤异常波 II II Abstract Earth tide is the elastic-plastic deformation of the earth caused by the tide force of sun、moon and other objects. Tidal observation is an important method of classical geodesy, and it can reflect the physical phenomenon inner the earth. With the development of the space technology and the global geodynamics project, tidal observation has a great prospect. However, the transfer function of the tidal observation instruments is not as complete as the function of seismic observation instruments, so we have great difficulty in studying and researching the data of tidal. In the long-term tidal and seismic observation by HUST station, we found out that there are a lot of signals, whose frequency is between the signal of tide and earthquake, but these signals shouldn’t be observed because they should be filtered. We don’t know the transfer functions of the tidal observation instruments, so we can’t study and research these signals deeply. We just call them “Abnormal Tremor Waves”. Recently, I have derived the transfer functions of DZW gravimeter and VS-1 tiltmeter, and discussed the experiment of the verification to the transfer function. And with the transfer function we’ve researched the “Abnormal Tremor Waves” and found out that they are caused by the weak-damp of the instruments and the aliasing of the sampling. Then I’ve study the functions of the tidal and